79868409 has 4 divisors (see below), whose sum is σ = 106491216. Its totient is φ = 53245604.

The previous prime is 79868401. The next prime is 79868429. The reversal of 79868409 is 90486897.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79868409 - 2³ = 79868401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79868401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13311399 + ... + 13311404.

It is an arithmetic number, because the mean of its divisors is an integer number (26622804).

Almost surely, 2^79868409 is an apocalyptic number.

It is an amenable number.

79868409 is a deficient number, since it is larger than the sum of its proper divisors (26622807).

79868409 is a wasteful number, since it uses less digits than its factorization.

79868409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26622806.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 79868409 is about 8936.9127219639. The cubic root of 79868409 is about 430.6505548383.

The spelling of 79868409 in words is "seventy-nine million, eight hundred sixty-eight thousand, four hundred nine".